Just caught up. I felt all sorts of ways when someone name dropped the Rob Lucci and started transforming into a cat.
Assuming cat guy actually has two narratives, one being the origin of the gomu-gomu fruit, and the other with some slave/deity secret Jimbei's holding onto, this fight just got more interesting (to me) than the rest of Wano combined. Lore drops are a sweet nectar that Oda drip feeds me every year or so.
Yamato seems much more likely than Carrot; she was simply a long term rental. All Straw Hats have a Dream to set out to sea for... Carrot does not.
Did Yamato eat the "Mink Mink" fruit and this is her Sulong? What is this creature, if not a Pokemon?